How to eliminate breeding pigs?

(agricultural get Rich Network) how to eliminate breeding pigs? If the empty period of sows is too long, the cost of empty period is very high. The calculation of its loss can be found in the article "Pig production from the Economic Evaluation of sows" in the sixth edition of this issue. It can be seen that each empty day of each sow is equivalent to an income loss of 11 yuan. This also shows the importance of improving sow production performance and increasing economic benefits by reducing empty days. Normal pig farm: sows produce 2.2 babies a year and give birth to more than 10 live pigs. each boar should be guaranteed to breed 20-30 sows. If the pig farm does not meet the above targets, it is likely to raise a lot of ineffective boars and sows. There are mainly the following kinds of ineffective boars and sows: sows with long-term non-estrus; sows with repeated recurrent estrus; sows with habitual abortion; sows raised in pregnancy houses but do not return to estrus; sows with small litter number or poor lactation performance; boars with foot and limb disease that can not be used; boars with low frequency of use; boars with poor semen quality and low conception rate. The breeding of these boars and sows, a waste of manpower, a waste of feed, a waste of barracks, etc., should be eliminated in time.